Wrench



F. C. DYER AND S. IVlcD. ROBERTSON.

WRENCH.

APPLICATION FILED ocT. I3. 1919.

l Patented Sept. 14, 1920.

IIII IIIII' [Nl/PENT .5 if? UNITEE srArss SAMUEL MCD. ROBERTSON AND FREDERICK c. DYEE, Aor roEoNro, ONTARIO, CANADA.

WRENCH. i

To all whom t may Concern.'

Be it known that we, SAMUEL MoD. Ros- ERTsoN and FREDERICK C. DYER, of the city of Toronto, in the lcounty of York, -Province of Ontario, Canada, have invented certain new and useful Improvements in Vrenches, of which the following is'aspeciiication.

This inventionrelates to wrenches with adjustable jaws of the type 'commonly known as monkey wrenches, and our object is to devise a wrench easily adjustable with one hand and which is therefore much more convenient for use by one-armed men than the ordinary types of adjustable wrench.

lVe attain our object by means of the constructions hereinafter described and illustrated in the accompanying drawings in which- Figure l is a longitudinal section of our improved wrench;

Fig. 2 a rear elevation of the same; and

Fig. 3 a section on the line cada in Fig. 1.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

l is the movable jaw of the wrench, which is connectedto the shank 2 which is flattened on at least one side, the preferable 'construc- Vtion being to make it substantially rectangular in cross section. 3 isa'threaded end formed on the shank. 4 is the fixed jaw of the wrench, which is 'secured to the upper end of a tubular stem. The upper part 5 of this stem'is flattened to form a guide for the flat sided shank 2, while the llower'part 6 is cylindrical. This shape is readily given lto the stein by suitably ldeforming a vpiece of tubing. j

Fitted within the cylindrical part of the stem is a tubular nut 7 internally threaded to engage the threaded end 3 of the shank 2.

A sleeve 8 is fitted over the cylindrical portion of the stem and 1s suitably secured to nut, as, for eX- the lower end` of the tubular ample, by means of a pin 9 driven through suitable holes in the parts. Thelower part of the tubular nut is preferably of increased diameter so as to come surface of the cylindrical portion of the shank, meeting the lower edge of the shank with a shoulder. This shoulder takes the endwise strain due to pressure tending to force the jaws of the wrench apart.

Specification of Letters Patent.

f movable jaw and to flush with the outer Y To prevent endwise movement of the sleeve 8 relative vto Vthe tubular stem, we form an annular groove 10 1n the outer surface of the cylindrical portionv 6 of the shank and thread through the 'sleeve 8 a groove.

From the construction described, it will be seen that the wrench is very simple in construction and can be made with a mini-V mum yof machine work. Further, as the adjustment is Ventirely through the sleeve 8, which forms the grip'v ofthe wrench, it is very easy to adjust the'spacing of the jaws with one hand to suit the nut with which the wrench is to be engaged. We prefer to form comparatively fine serrations 12 on the form a pair of deep transverse il-shaped grooves 13 in the fixed jaw. We find that withthis arrangement the wrench can be used as pipe wrench and is better adapted than Va wrench with flat faced jaws to'operate on nuts the sides of which have become rounded or otherwise damaged.

What we claim as our invention is In an Vadjustable wrench, the combination of a movable jaw; a flat sided shank therefor; a threadedy end on the shank; a fixed jaw; a tubular stem to one end of which said jaw is being flattened to guide the fiat sided shank, its end remote from the fixed jaw/ being cylindrical; a tubular nut fitting within the cylindrical part of thetubular stem vand engag-ing the threaded end of thefA shank; a

sleeve fitted 'over the cylindrical portion of the stem and having a driving'engagement with the outer end of the tubular nut, and a connection between the sleeve and the cy lindrical portion ofthe tubular stem preventing longitudinalmovement of one or the other, but permitting a movement of rotation.

Signed at Toronto', of September 1919.

SAMUEL MCD. EoBEErsoN. EEEDE o. DYER. Y

Canada, this 27 th day l/Vitnesses A. KIRBY,

E. M. TOZER.

Patented Sept. 14, 1920.

V Applicationled October 13, 1919. Serial No. 330,1116.

fixed, the tube adjacent said end.

`screw 11, the end of which engages in the 

